单项选择题

At the party, everybody congratulated the scientist（）winning the award after his years of hard work.

A. to
B. on
C. at
D. about

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单项选择题
How many people were killed in the fire（）

A.2. 
B.3. 
C.6. 
D.None.
单项选择题
Which of the following is not mentioned as a favorable factor contributing to the woman’s study（）

A. Interests in learning.
B. Previous learning experience.
C. Plenty of time.
D. Possession of a degree in education.
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